Subscription policies are defined for specific subscriptions, that is, between a specific Application and an API. If you want to restrict access to a particular API after a certain number of requests, you may configure an Advance policy from the Admin portal and add restrictions for your API from the Publisher portal.

please refer, https://apim.docs.wso2.com/en/4.3.0/design/rate-limiting/adding-new-throttling-policies/#adding-a-new-advanced-rate-limiting-policy